Difference between revisions of "How to use FFTW"

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* Step 3: Add library to project: first open [your_project_name].pro file in Qt Creator and add this line:
 
* Step 3: Add library to project: first open [your_project_name].pro file in Qt Creator and add this line:
<code>LIBS''= -lfftw3<code>
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<code>LIBS''= -lfftw3</code>
  
 
* Step 4: Example
 
* Step 4: Example
</code>#include <fftw3.h></code>
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<code>#include <fftw3.h>
<code>int N;
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int N;
  
 
fftw_complex *in, '''out;
 
fftw_complex *in, '''out;

Revision as of 08:23, 8 April 2015

How to compute FFT using FFTW in Qt

Getting Start

Note that I do this in Ubuntu operating system, in Windows some steps are different.

  • Step1: Download FFTW ([[1]])
  • Step2: Extract and Configure it (my path: /home/jafarabadi/Documents/fftw-3.3.4)

cd /home/jafarabadi/Documents/fftw-3.3.4 chmod x configure ./configure make make install

  • Step 3: Add library to project: first open [your_project_name].pro file in Qt Creator and add this line:

LIBS= -lfftw3

  • Step 4: Example

#include <fftw3.h> int N;

fftw_complex *in, out; in = (fftw_complex) fftw_malloc(sizeof(fftw_complex)N); out = (fftw_complex) fftw_malloc(sizeof(fftw_complex)*N);

fftw_plan my_plan; my_plan = fftw_plan_dft_1d(N, in, out, FFTW_FORWARD, FFTW_ESTIMATE); fftw_execute(my_plan);

fftw_destroy_plan(my_plan); fftw_free(in); fftw_free(out);

// A short tutorial: http://www2.math.uu.se/~figueras/fftw_tutorial/text/fftw_tutorial.pdf